Escapement mechanism for type-writers.



PATENTED OCT. 23, 1906.

APPLIOATIOI FILED KAY 5, 1904.

2 SHEETS-SHEET 1.

No. 833,971. PATENTED OCT. 23,1906.

' C; J. PAULSON.

I BSGAPEMENT MECHANISM FOR TYPE WRITERS.

APPLICATION FILED HAY 5, 1904.

' 2 SHEETS-SHEET 2.

UNITED sTApEs PATENT OFFICE. f

To all whom it may concern: a

7 Be it known that 1, CHARLES" J. PAULSON,

' a subject of theKing of Sweden and Norway,

residing in Brooklyn, in the county. of Kings and State of New York, have invented certain new and useful Improvements in Escapement Mechanism for Type-Writers, I of which the following is a specification.

This invention has reference to means whereby the movement or travel of a work- 'carrying member, such asatype-writer car-- riage, may be accomplished intermittently 'or ste by step by a sim lified, efficient, and durab emechanism whic may preferably be controlled and actuated by a key mechamsm.

The invention, as is obvious, isapplicable to anysuch character of devices as may-reuire means for intermittently'movin an e ement or carrier,- and in its present. orm' such invention is embodied in atype-writer. ll; is an object of the present invention to simplify the method of causing a type-writer carria e or other work-carrying means to escape rom'one working position to another,

and. to do so b a simple, efficient, durable,

p and economica construction.

I further make a highly-sensitive or responsive esca ement mechanism such as will be highly e cient and exact in eration when the same is subjected to a big rate of speed by an operator, and I still further effeet a simplified adjustment whereby the es fcapeme'nt', mechanism may be suitably reguwrlter,

lated for different speeds. An embodiment of the invention isillustrated in the. hereunto-annexed sheets of drawings, u on which Y Figure 1 1 lustrates inpers ective and also in detail the escapement mec anism. Fig. 2 is atransverse sectional elevation of a t pepartially broken away, and w h shows e connection between the key-bar and the escapement mechanism, ,together with other details of construction; and Fig, 3

is a section looking from the rear of a ty ewriter on line a: as of Fig. 2 and partially broken away. r p Similar characters of reference indicate like arts throughout all the figures.

T e esca ement mechanism is applicable to any suita le form of type-writersuch, for

instance, as one comprising a frame 1, having a vertical extension 2, at or near the upper end of which is mounted a frame 3, having a plurality of type-bars, 4.which are :movably Specification of Letters Patent. Applioatioxrfiled my 5, 1904. sol-a1 No. 206.464.

' housing 6;

Patented Oct. 23, 1906.

mounted on Movably mounted in a suitablyeformed bed' 7 is a carriage 8, bearing a platen 9, and which carriage, 1n the resent instance may be drawn along its pat of movement when intermittently released by a spring 10, coupled with said carriage 8 by a strap 11,

guitably secured to or carried by a downwardly-extend' portion 12 of'the bed 7 is a bracket '13, whic in the present instance is secured to said portion 12 by a set-screw 14, Fig. 2, and u on which bracket is mounted suitable mec' anism hereinafter to be described, and which constitutes in part the esca ement mechanism. uitably connected to or carried by the bed portion 7 is a shaft 15, which in its present form and referably. so comprises an elongated screw aving a head 16 with a cer tain portion of its length suitably formed to constitute a shaft, upon which may rotate a collar or sleeve'17. Carried by'this rotatabl mounted sleeve is a pinion or ratchetwlieel 18, having teeth 19, which are ada ted suitable bearings 5 said to'mesh with a row of teeth 20, carried y a wheel 18. These teeth 25 are adapted to engage a-Working pawl or .finger 26 of substantlally ogee shape, mounted upon an.oscillatory member 27 ,movably mounted upon an upwardly-extending portion 28 of thebracket 13, which is preferably mounted thereon by having a dovetailed slide 29 on the under side of said movable member 27,

and which occupies an undercutgroove' in y the upwardlyextended portion 28 of the bracket 13. The pawl 26 is referabl so formed or bent as to preferab y be ab e to rock upon the member 27 and takes over a stud 30, as seen in Fig. 1. A spring 31 takes around said stud 30 and over thep'aWl 26,

thence is bowed upwardly at 32, and its free end is fastened to the member 27 by a setscrew 33. This spring surrounds the stud or post 30 and so bears on the awl 26 as to cause its pressure to favor that side of the awl 26 farthest away from the extremity t ereoflwhichengages the teeth 25 of the wheel of the teet mounted on said mem er 27, when the fur- 24, so that, as will be later on explained, when the pawl is released from the tooth the tendency of said spring will be to cause the end 34 of the pawl 26 to be forced down, while the tooth-engaging ortion of said pawl will rise to engage with the next succeeding tooth, and for the purpose of limiting or determining the extent of movement which said pawl 26 shall have I provide a set or adjustment screw 35, which cooperates with a screw-threaded portion in a member 27, and which screw-threaded portion is suitably split at 36, so that the body of the screw 34 may be clamped tightly in place, preferably by a set-screw 37, passing through the member 27 transversely to the plane of the stud 30. For the purpose of maintaining the slidable member 27 in proper location upon the bracket 28 I provide a resilient member 38, such as a spring, which is suitably hitched to the bracket 28 and to a stud 39 on the member 27. In this way the member is urged normally toward the wheel 24, so that the tooth-engaging end of the pawl 26 may be in constant engagement with one of the teeth 25 of said Wheel 24. Also suitably mounted on said bracket 28 is a bell-crank 40, suitably pivoted at 41, and one of whose arms, as 42, engages with the end 43 of the member 27 Suitably pivoted to the other arm of the bell-crank, as at 44, is a link 45, which is carried by a shaft 46, from whence proceed arms 47, leading to a main shaft 48, to which is secured a plurality of key-bars 49, connected to the type-bars 4 through links 50. A pressure upon any one of these key-bars 49 will cause the movement of the shaft 48 and the consequent downward movement of the shaft 46 through the connection 47, whereupon the link will cause the bell-crank 40 to move upon its pivotal point 41, whereby to urge the member 27 in a position oppo site to 1ts normal position, causing at the same time, the spring 38'to expand. At the instant of such operation, aswill be obvious, the tooth-engaginglpoint of the pawl 26 will release one o' t e teeth 25, whereupon through the instrumentality of the s ring for operating on the carriage 8 the rac -bar 21 will urge the wheel 18 to rotation, thus also causin the wheel 24 to rotate until one 25 is en aged by a tooth 52,

ther movement of the wheels 24 18 and the carriage 8 will be arrested. During this minor portion of the release of the escapement by the pawl 26 and the rearrest of the same by the tooth 52, said pawl 26, through the instrumentality of the spring 31 hereinafter mentioned, will be so elevated at its tooth engaging extremity by the action of the spring 31 as to cause it to be ready to take into the next succeeding tooth of the wheel 24 as soon as said wheel is released by said tooth 52, when the spring 38 is permitted to assert itself to return the member 27 to its normal position, it being understood that during the first partof such movement the carriage will have been partially progressed and during the latter part of said movement the carriage will have com leted a movement equal to one step or one etter-space. Thus it will be seen that I have provided an inexpensive, durable, and eflicient structure ositive and accurate in its action and whic is designed to be highly res onsive to uick actions of the machine.

do not con ne myself to the detailed construction of the device as described in this application, it being before remarked that such an application of the invention as here shown is for the purpose of illustration only and that within the purview of the invention I may resort to other constructions or arrangements of parts so long as I adhere to the principle involved.

Having thus described my invention, I claim.-

. 1. In an escapement device, the combination of a ratchet-wheel, a slidable carrier, a dog stationary on the carrier, a spring arranged to retain the carrier normally with such dog out of engagement with the ratchetwheel, a second dog mounted on the carrier and comprising a stri fulcrumed at an intermediate part thereo on the carrier and arranged to normally engage the ratchet-wheel by one end, a spring on the carrier to enga e the latter dog and tending to move it in a d irection the opposite to that in which moved by the ratchet-wheel fiom the carriage-tension, and an adjustable stop on the carrier engaging the other end of the second dog and arranged to limit the movement of the dog by the ratchet-wheel.

2. In an escapement device, the combination of a ratchet-wheel, a slidable carrier hav ing a dog stationary thereon, a s ring ar-- ran ed to retain the carrier with sai dog normal y out of en agement with the ratchetwheel, a second o consisting of a strip of a substantially ogee orm, and having an aperture at an intermediate portion, and also an aperture at one end portion, a pin on the carrier, the second dog being inserted on the pin at its intermediate apertured portion, and thereby arranged to have one end in osition to normally engage the ratchet-w eel, a spring on the carrier engaging the second dog and arranged to move it in a irection the opposite to which moved by the ratchetwheel, and a screw passin through the apertured end of the second 50 for limiting its movement by the ratchet-w eel.

3. In an escapement device, the combination of a ratchet-wheel, a slidable carrier, a dog stationary on the carrier, means for retaining the carrier normally with such dog out of engagement with the ratchet-wheel, a second dog mounted on the carrier and com prisingia strip fulcrumed at an intermediate part t ereof-on the carrier and arranged to normally engage the ratchet-wheel by one end; a spring on the carrier to engage the lat ter dog and tending to move it in a direction the opposite to that in which moved by the ratchet-wheel from the carriage-tension,- and an adjustable stop on the carrier engaging the out of engagement with the ratchet-wheel, a

second dog consistin of a strip of a substantially ogee form, an having an aperture at an intermediate portion, and also an aperture at one end ortion, a pin on the carrier, the second dog ing inserted on the pin at its intermediate apertured portion, and thereby arranged to have one end in osition to normally engage the ratchet-whee a sprin on the carrier engaging the second dog an arranged to move it in a direction the opposite to which moved by the ratchet-w eel' and a-screw passing throu h the apertured end of the second dog for limiting its movement by the ratchet-Wheel.

- Signed at Nos; 9 to 15 Murray street, New York, N. Y., this 3d da of Ma 1904.

CHAR ES J. AULSON. .Witnesses:

FRED. J. DoLE, FRED. W. BARNAcLo. 

